JPH03124369U

JPH03124369U -

Info

Publication number: JPH03124369U
Application number: JP4884490U
Authority: JP
Priority date: 1990-02-21
Filing date: 1990-05-10
Publication date: 1991-12-17

Description

[Brief explanation of the drawing]

第１図は本考案のヘツド位置検出装置を適用し
た記録情報の記録再生装置の全体構成説明図、第
２図はアーム駆動部の構成説明図、第３図はエン
コーダユニツトの構成説明図、第４図ａ及びｂは
可動スケールの構成を示す平面図及び一部拡大図
、第５図は可動スケールの構成説明図、第６図ａ
，ｂ及びｃは従来のエンコーダユニツトにおける
非平行光の漏洩状態を示す説明図、一部拡大図及
び検出される波形の説明図、第７図ａ，ｂ及びｃ
は本考案の実施例におけるエンコーダユニツトに
おける非平行光の遮断状態を示す説明図、一部拡
大図及び検出される波形の説明図、第８図は他の
実施例の説明図、第９図ａ，ｂは従来の説明図で
ある。２０：デイスク、２１：ヘツド、２４：デツキ
、２５：モータ、２７：アーム、２８：ピボツト
軸、３０：カートリツジ、３３：コイル、３５：
磁気回路部、３７：支持片、４０：可動スケール
、４２：センサ部、４５：発光素子保持部材、４
６：発光素子、４７：固定スケール、４８：受光
素子、５１ａ，５１ａ′：マスク、５１ｂ，５１
ｂ′：透光性スリツト、５５ａ：マスク、５５ｂ
：透光性スリツト。 FIG. 1 is an explanatory diagram of the overall configuration of a record information recording/reproducing apparatus to which the head position detection device of the present invention is applied, FIG. 2 is an explanatory diagram of the configuration of the arm driving section, and FIG. Figures 4 a and b are a plan view and partially enlarged view showing the configuration of the movable scale, Figure 5 is an explanatory diagram of the configuration of the movable scale, and Figure 6 a
, b and c are explanatory diagrams showing the state of leakage of non-parallel light in a conventional encoder unit, partially enlarged diagrams and explanatory diagrams of detected waveforms, Fig. 7 a, b and c
8 is an explanatory diagram showing a non-parallel light blocking state in the encoder unit according to an embodiment of the present invention, a partially enlarged diagram and an explanatory diagram of detected waveforms, FIG. 8 is an explanatory diagram of another embodiment, and FIG. 9 a ,b are conventional explanatory diagrams. 20: disk, 21: head, 24: deck, 25: motor, 27: arm, 28: pivot axis, 30: cartridge, 33: coil, 35:
Magnetic circuit section, 37: Support piece, 40: Movable scale, 42: Sensor section, 45: Light emitting element holding member, 4
6: Light emitting element, 47: Fixed scale, 48: Light receiving element, 51a, 51a': Mask, 51b, 51
b': Translucent slit, 55a: Mask, 55b
: Translucent slit.

Claims

[Scope of Claim for Utility Model Registration] (1) A movable scale protruding from a rotating arm or a linear arm equipped with a head that scans along a data track on a disk as a recording medium, and a movable scale facing the movable scale. It consists of a fixed scale arranged, and a light emitting element and a light receiving element arranged on both sides with the movable scale and the fixed scale in between, and the movable scale and the fixed scale are each placed on the surface of a transparent plate-like body to block light. In the head position detection device having a configuration in which a plurality of transparent slits are formed by forming a transparent mask, the transparent slits in at least one of the movable scale and the fixed scale are , the slits are formed on both sides of the plate-like body, and the slits on both sides are formed in the same position and in the same shape, the movable scale is placed on the light emitting element side, and the fixed scale is placed on the light receiving element side. 1. A head position detection device in a disk device, characterized in that: (2) In the head position detection device according to claim (1),
A head position detection device for a disk device, wherein the fixed scale is arranged on the light emitting element side, and the movable scale is arranged on the light receiving element side.